No by no means did I mean to try to post bump!! I edited them so everyone could stay on topic here. It wouldn't let me save and empty post so I put smile's there instead. not trying to flame or argue or anything of that matter. But I get what the post is about. so lets move on to something better.
If I read right smokeout08Impala in your sig. you have an sundown sa-8 d2 coming. Thats a beefy little 8. For the post though if the car came with subs already in it. Taken they are not factory, then replace them with the same size. I'd go 1 12.